Engine system failure

I just got my Ford Focus style diagnosed by a mechanic who said the following problems are;

Code Make Description P0299 Generic Turbo / Super Charger Underboost

Code Make Description P010F Generic Mass or Volume Air Flow "B" Circuit High

what are these and what do I need to fix?

the mechanics did not seem assured what that meant so I am hesitant to take it back to them as they cannot give me a price quote, because they claim they need to take engine apart to see the exact problem.